This may not belong here, but I believe it should be told. Two days ago after sutible preparation, I went to my favorite station and poured 2 oz of 100 % pure Acetone, then filled up my tank with regular. Reseting my trip odometer to zero, I hopped on the freeway and drove about 54 miles south, I then drove 54 miles back to the same station and refilled my tank. Well, hoping for a nice increase in milage, as I have been reading about, I found the 108 miles took 3.24 gals. Thats about 33.3 miles per gal and that sounds great, except my 2006 Scion XB with the 1.5 liter engine got exectly that before before I added the Acetone. I'm wondering if the milage increases posted by others are on cars with poor milage cursed by carburators, cars that werent really factory setup for good milage, where-as my XP with the little engine is sucking out the best milage I'm going to get unless I go to an added fuel, such as HHO. Then, I'll still be getting the same milage per unit of energy, but since the energy unit will be divided between the 2 fuels, my gas dollar will shrink per mile. Anyway, I've vented my spleen on this subject, any comments would be welcomed.